Milling machine



June 18, 1940. R B, PARKER '2,204,945

IILLING MACHINE Filed Aug. 31,' 1937 '7 Sheets-Sheet 1 'M 62 33 36 35, |11 I lwL y ai@ '7 sheets-:inem 2 ibi!! j. m/ m R. B. PARKER MILLING MACHINE June 18, 1940.

Filed Aug. 31, 1937 June 18, 1940- R. B. PARKER 2,204,945

MILLING IIAGHIINE Filed' Aug. 31, 1957 7 sheets-sheet 4 f@ I f feg y Eggi June 18, 1940, R, B PARKER 2,204,945

MILLING MACHINE Filed Aug. 51, 1957 '7 Sheets-Shea?l 5 June I8, Ill R. B. PARKER 2,204,945

IILLING HCHIHE June 18, i940. R. B. PARKER MILLING maxima Filed Aug. 3l. 1937 7 Sheets-Sheet 7 MIMI Patented v.June 18,

Friar.

lamme MACHINE Robert n Parker, Claremont, N. n., assigner to Sullivan Machinery Company, a corporation of Massachusetts Application August 31,1113'1, serial No. 161,823

21 claims.

This invention relates to-milling machines, and more particularly, but not exclusively; to improvements in a hot milling`machine es peciallydesigned to operate on an appropriately heated rock 5 drill bit, for forming or sharpening the cutting surfaces of the bit.

An object of this invention is to provide an improved milling machine, whereby the work may be quickly formed with a minimum amount of manipulation, and, resultantly, the cost of forming the work maybe maintained extremely low.

llinezpther object is to provide an improved hot milling machine especially designed. to operate on an appropriately heated rock drill bit, whereby the cutting face and sides ofthe cutting portion of the bit may be readily and quickly formed in an improved manner. A further object is to provide an improved milling machine especially designed to use in forming or sharpening rock drill bits and having improved means for positionlng and supporting the drill bit and for guiding the drill bit with respect to the milling cutters during the forming or sharpening operation. Yet another object is to provide an improved milling machinev having. a pair of milling cutters driven at a relatively high speed, and improved means for guiding and positioning the drill bit relative to the cutters for forming the cutting face and cutting sides of the cutting portion of the bit, the bit supporting means being vadjustable to locate .the bitin diiierent positions with respect to the different cutters so that the bit may be formed in an improved manner. Still another object is to provide an improved supporting and guiding structure for the bit support, whereby the bit is maintained in a vertical position during forming of the bit face, and adjustable to locate the bit in a horizontal position during forming of the 'sides of the cutting portion of the 4@ bit. A still further object is to provide a novel bit securing means for attaching the bit to the bit holder barrel, together with improved means for supporting the barrel withY respect to the milling cutters. A still further object is to provide an improved means for locking the barrel againsty rotation with respect to the holder support duriing the forming of the bit face and for releasing the barrel for free rotation with respect to the holder support during forming of the sides o! 50 the bit. These and other objects and advantages of the invention will, however, hereinafter more fully appear.

In the accompanying drawings there are shown.

for purposes of illustration three forms which the invention may assume in practice.

In these drawings:

Fig. I is a top plan view of the preferred illustrative form of the improved milling machine.

Fig. 2 is a side .elevational view of the milling machine shown in Fig. 1.

Fig. 3 is an enlarged fragmentary front end elevational view showing the improved support' ing and guiding structure for the bit holder barrel.

` Fig. 4 is a side elevational view of the strucl ture shown in Fig. 3.

Fig. 5 is a vertical sectional view taken substantially on line 5-5 of Fig. 4.

Fig. 6 is a horizontal sectional view taken substantially on line 6 6 of Fig. 4.

7 is a detail sectional view taken substantially Online T-'l of Fig. 4, showing the spindle and bearing structure for the face forming cutter.

Fig. 8 isa detail view showing the means for relatively adjusting the cooperating parts of the zo l face milling cutter.

Fig. 9 is a view, with parts shown in section, showing the bit in operative position with respect to the side `forming cutter and with the latter shown in elevation.

Fig. 10 is an enlarged detail sectional view taken substantially on line lll-I0 of Fig. 4, showing the spindle and bearing structure for the side cutter.

Fig. 11 is a view in longitudinal section taken a0 substantially on line lI-,II of Fig. 3.

Fig. l2 is a detail sectional view taken substantially on line I2-l2 of Fig. 11.

Fig. 13 'is a longitudinally extending vertical sectional view, with parts shown in side eleva- 35 tion, taken substantially on line lS-I of Figs. 1 and 3.

Fig. '14 is a detail plan view illustrating the bit supportin and guiding structure shown in Fig. i3, with parts omitted to facilitate illustration.

Fig. 115 is a longitudinally extending vertical sectional view, with parts shown in side elevation, illustrating a. modified form of construction.

Fig. 16 is a plan view, with parts shown in section, of the construction shown inFig. 15.

Fig.' 17 is a fragmentary plan view, with parts shown in section, illustrating another modified form of construction. A

Fig. 18 is a side elevational view of the construction shown in Fig. 17.

Fig. 19 is a fragmentary side elevational view, similar to Fig. 18, showing parts in a different position.

Fig. 20 is a detail sectional view taken substantially on line 2 0-20 of Fig. 18.

In the preferred illustrative embodiment of the invention disclosed in Figs. 1 to 14, inclusive, there is shown a milling machine of the type known as a hot milling machine especially designed for forming the cutting portion of an appropriately heated rock drill bit, such as a detachablerockrill bit of a character similar to that disclosed in Figs. l to 5, inclusive, of the patent to Paul H. Nast, granted Aug. l, 1939, No. 2,168,102. It will be evident, however, that the improved milling machine may be employed in general milling work.

The improved milling machine, in this instance, compi'ses a base frame I having secured thereto, at one side thereof, a shelf-like bracket 2 on which is supported a motor 3. Journaled within the upper portion of the base frame on parallel axes extending transversely of the frame in parallelism with the axis of the motor power shaft, are milling cutters 4 and 5, hereinafter known as face and side cutters respectively. As shown in Figs. 7 and 10, respectively, the milling cutters 4 and 5 are secured to the projecting ends 6 and 6' of horizontal spindles 1 and 8 respectively journaled within ball bearings supported within bearing brackets 9 and I0 suitably secured to the upper part of the base frame. Keyed to the other ends of the spindles are pulleys II and I2, respectively, while journaled on ball bearings supported by a stub shaft I3 secured to the frame, is an idler pulley I4 arranged with its axis parallel with the axes of the pulleys II and I2. Keyed to the power shaft i5 of the motor 3 is a driving pulley I6, and engaging the pulleys I6,l

I2, I4 and II is an endless driving belt i1. The driving belt and pulleys are housed within a chamber I8 formed by a housing I9 secured to the frame.

The holder barrel for the bit comprises a tubular barrel member 20 of cylindrical form having a slotted end providing resilient jaws 2l formed with inwardly inclined surfaces 22 engaging the exterior surface of a jaw-expanding wedge 23.

Suitable means, preferably a pinv or lug 24, fixed to the wedge and projecting in a slot between a pair of jaws prevents rotation of the wedge relative to the barrel, while permitting axial wedge movement. Extending centrally within the barrel member 20 is an operating rod 25 threaded at 26 within the jaw-expanding wedge and provided at its outer end with an operating handle 21. The jaws 2l are receivable within a socket 28 of the drill bit, generally designated 29, and when Y the operating rod 25 is rotated by the handle 21,

inward axial movement of the wedge relative to the bit is effected, d ue to the threaded engagement between the rod and wedge, thereby spreading the jaws 2| apart and causing the same to grip the drill bit to hold securely the bit in forming position on the holder. The barrel member is threaded at 30, and arranged between collars 3l, 3l adjustably threaded thereon is a member 32 having fa handle portion 33 adapted to be grasped by the operator, whereby the barrel may be rotated, for a purpose to be later explained.

Now referring to the bit supporting and guiding structure for guiding the bit with respect to the milling cutters during the forming or sharpening operation, it will be noted that arranged in longitudinal parallel relation at the opposite sides ci the face milling cutter 4 are cylindric guide rods 35, 35, and the inner ends of these guide rods are fixed within a transverse frame 36 pivotally mounted at 31 on a bracket 3B fixed to the base frame, whereby the guide rods may be adjusted in vertical planes. The outer ends of the guide rods 35, 35 are fixed within a transverse frame 39, and means is provided between this frame and a bracket 40, secured to the base frame, for adjusting the guide rods in vertical planes about the pivot 31. This adjusting means comprises a screw 4I pivoted on a transverse axis at 42 to a support member 43 in turn secured by a nut 44 to the bracket 40. The member 43 is longitudinally slotted at 45 to permit swinging of the screw 4I in longitudinal planes about its pivot. This screw is receivable within a slot 46 formed within a projection v41 integral with the frame 39, and threaded on the screw and engaging the opposite sides of the slotted projection are nuts 48 for adjusting the frame 39 and guide rods 35, 35 in a vertical direction about the pivot 31. This adjustment of the guiding structure enables adjustment of the bit-holding structure with respect to the face milling cutter 4. Mounted on the guide rods 35, 35 for sliding movement longitudinally therealong and pivotally mounted at 49 for swinging movement about the longitudinal axis of one of the guide rods is a work holder supporting frame 53 having an integral arm 5I provided near its extremity with a concave guiding surface 52 engaging the upper surface of the other guide rod 35 to aid in guiding of theframe along the rods. Formed on this frame 56 is a socket 53 receiving a block 54 held within the socket by a screw 55, and this block has a V-shaped seat 56. Pivoted at 51 on a projecting lug integral with the frame is a clamp member 58 formed with a socket 59. Seated within this socket is a semi-circular bushing 6l held within the socket by a screw 6I. Pivotally mounted at 62 on a slotted projection integral with the frame is an eye-bolt 63 having threaded thereon an adjusting nut 64. Pivotally mounted at 65 on this nut is an operating lever 66 formed with a cam surface 61. As clearly shown in Figs. 5 and 6, the work holding barrel 20 is receivable within the seat 56 of the block 54, and when the clamp 58 is in the closed position shown in Fig. 6, the bushing 60 engages the outer surface of the tubular member 20, and when the lever 66 is swung about its pivot, the cam effects tightening of the eyeboit 63 to clamp the barrel in position on the sliding frame 50. When the parts are in the position shown in Fig. 6 and the cam 61 is released to relieve the clamping pressure on the barrel, the latter may be rotated on its seat within the clamp, as will later be described.

Threaded within the frame 39, at 68. is a stopmember 69 having an adjusting nut 10, and the frame 50 is engageable with this stop member when in its outermost position on the guide rods, in the manner shown in Fig. 6, the stop member limiting outward movement of the sliding frame along the guide rods. Formed integral with the sliding frame 5,0 in substantially right angle reiation with respect to the arm 5I, is an arm 15 having a concave guiding surface 1I, and when the frame 50 is swung about its pivotal mounting on the guide rod from the position shown in Fig. 5 to the position shown in Fig. 9, the arm 1I underlies the other guide rod with the guiding surface 1I engaging the lower surface of the rod. When the frame 50 is in the position shown in Fig. 5 with the holder barrel vertically disposed, sliding movement of the frame inwardly along the guide rods is limited by an abutment in the form of a stop collar 12 fixed to the one of the rods 35 which does not extend through the frame 50, and when the frame reaches this inward limit of slidlng movement, it may be swung about its pivotal mounting on the other rod, and,

' due to the oil-set arrangementl of the arm 18,

the guiding surface on the arm will then engage the lower surface of the rod -atthe inner side of the abutment 12, so that when the frame is in the position shown in Fig. 9, further inward sliding movement of the frame along the rods is possible. When the frame isin the position shown in Fig.' v9, with the holder barrel horizontally disposed, sliding movement of the frame along the rods is limited by an abutment collar 13 adjustably threaded on the rod. The collar 13 is provided with a lock nut 14. For preventing `swinging movement of the sliding frame about its pivot relative to `the guide rods during the milling operations, there are provided guide plates 15 and 16 secured to the top and bottom respectively of the guide rod 35 which does not extend through the frame 58, so that when one or the other of the frame arms 5i 18 is slid between the guide plate with which it cooperates .and the rod 35, swinging of the frame is prevented.

Now referring to the particular structure of the drill bit and the milling cutter shapes, it will be noted that formed on the cutting face of the bitare wedge-shaped portions bounded by converging plane surfaces 11, 11 intersecting along diametrically alined cutting edges 18, 18; and ar- ;{Qffranged diametrically at the opposite sides of the alined cutting edges near the outer projections of the bit are chopping edges 19, 19 at the outer extremities of inclined plane surfaces 88. The lateral surfaces of the cutting edges andthe surfaces 88, in this instance, lie in the sides of dihedral angles, and the surfaces intersect along lines parallel with the cutting edges. The specific bit structure does not per se enter into this invention and is clearly described in the Nast patent mentioned above, and therefore a more detailed description thereof is unnecessary. As clearlyshown in Fig. 7, the face milling cutter 4 comprises cooperating parts 8| and 82, each having on its inner surface projections 88 projecting within sockets 84, so that the two milling parts are interlocked'against relative rotation, but free for relative axial adjustment. As sh'own in Fig. 8, when it is desired relatively axially to adjust the cutter parts, washers 85 of different Vthickness may be interposed between the cutter parts, in the manner shown. The cooperating cutter parts are formed with relatively inclined cutting surfaces 88, 81, one of less angle than the other, and shaped to conform to the shape of the plane cutting surfaces on the face of the bit. From the foregoing it will be evident that the 'surfaces on the bit extend in parallelism acro'ss the bit face, and therefore it is necessary to move the bit in a rectilinear path tangentially with respect to the face cutter 4, so that these parallel bit surfaces are appropriately formed. The side cutter' 5 is formed with tapered teeth 88 shaped to'conform to the inclined side surfaces 88 of the bit, so that when the barrel and bit are brought into the horizontal position shown in Fig. 9,`and the'bit holder barrel is rotated, the side surfaces of the cutting portion of the bit are appropriately formed.

Improved means is provided-for definitely and accurately locating theI drill bit relative to the facecutter 4, so that when the barrel is inserted within the sliding frame, the bit is definitely located in position on the frame. This bit-locating, or so-called bit-gauging means, comprises parallel gauge pins 88, 98 xed to the frame 39 and arranged parallel to the axes of the guide rods 85; and when the holder barrel ls inserted within the sliding frame 58, the bit is dropped in position with its inclined surfaces 11, 11 engaging the gauge pins, thereby insuring proper y positioning of the cutting face with respect to 'y forming or sharpening operations, suitable housing means may be provided forthey cutters, and in this instance, the side cutter 5 is provided with a cover 9| pivoted at 82 so that the cover may be swung outwardly away from the milling cutters, This cover is cut away at 83 to enable lateral movement of the bit into engagement with the side cutter. When it is desired to form or sharpen drill bits of different sizes, the screw and nut means 4I, 48 may be adjusted to vary the angular relation of the guiding structure about its pivot 31 relative to the face cutter il, and the stop collar 13 may be adjusted relative to the guide rod to vary the range of movement of the siiding frame 58 relative .to the side cutterl `5. Also, if desired, milling cutters of different diameters may be substituted for those disclosed, and the guide structure and stop collar adjusted to compensate for the variations in diameter of the cutters.-

The mode of operation of the improved milling within the socket in the bit, and the bit locked in position on the barrel by the gripping en- -gagement of the jaws within the bit socket.

When the bit is securely locked in position on the holder barrel, the barrel is inserted in position within the seat 56 on the block 54 mounted on the sliding frame 58, and the clamping member 58 is'partially but not tightly closed. The barrel is then slid downwardly to bring the surfaces on the bit face into engagement with the parallel gauge pins 98, 8,8, thereby to locate properly the bit with'respect to the cutting surfaces of the face cutter 4, and when the bit is properly located, the lever 56 is swung about its pivot to causeI the cam surface 61 to close tightly the clamping member to lock securely the holder barrel to the sliding frame 58. When the bit is .properly located in the position shownin Fig. 13

and securely locked to the sliding frame 58, the operator slides Athe frame 58 inwardly along the parallel guide rods, thereby moving the bit across the vcutting surfaces of the face milling cutter, thereby to form the cutting surfaces of the bit. The sliding frame is slid inwardly Aalong the guide rods until the frame abuts the stop collar 12, and the operator then swings the handle 86 to release the holder barrel member 28 for rotation, and manually swings the holder lframe 58 about 'its pivotal mounting on the guide rod 35 to cause the arm 5I to move away from the other guide rod 35 and the right angle arm 18 to move into engagement with the latter guide rod side surface of the holder 58, and while the handle 33 is used to rotate the bit and its holder, the

sliding frame 50 may be slid further inwardly along the rods until the frame engages the stop collar 13 with the parts in side forming position adjacent the side cutter 5, as indicated in dotted lines in Fig. 13, and as shown in full lines in Fig. 10. The bit is rotated, with the holder 50 against the stop 13, at least a. full turn with respect to the side cutter, thereby to form properly the sides of the bit. Obviously the gauge of the bit may be accurately controlled by the setting of the collars 3| After these milling operations are completed, the clamp 58 is released and the holder barrel removed from the sliding frame and the bit released from the holder barrel by releasing the jaws 2| of the barrel from. the bit. As previously mentioned,v when it is desired to change the dimensions of the cutting edge supporting surfaces on the bit face, this is possible by inserting washers of different thickness between the inner adjacent surfaces of the axially vadjustable face cutter parts. By way of summary, it may be noted that the bit is rst given a rectilinear traversing movement with respect to the face cutter 4 and thereafter turned onto its side and given a rotary motion with respect to the side cutter 5. The face of the bit is formed by the first operation, and its gauge and its major peripheral conformation are determined by the second. l

In the modification shown in Figs. 15 and 16, the bit holder and guiding structure are similar to those above disclosed. In this instance, the sliding frame has no swinging movement with respect to the guide rods and the side cutter is arranged to rotate about a vertical axis, so that when the bit traverses the face cutter, it is brought immediately into engagement with the side cutter without swinging of the holder barrel and bit. In this construction, theslidinflr frame 98 is provided with guide portions 99, 99 slidably mounted on the parallel guide rods 35. 35. The' side cutter |00 is, in this instance, arranged with its axis vertical and lying midway between the parallel guide rods, the axis of the side cutter lying in a vertical plane arranged midway between and parallel to the side surfaces of the face cutter 4. Concisely put. a line midway between the' pins 90, the central plane ofthe face cutter 4, and the axis of theside cutter |00, lie in a common vertical plane. In this construction. the belt drive for the side and face vcutters is omitted and the spindle |0| of the side cutter and the spindle |02 of the face cutter have respectively connected thereto the power shafts of independent motors '|03 and |04. It will be evident, however. that any suitable form of drive for the cutter spindles may be employed. such as a right angle belt drive. The operation of this form of the invention is substantially the same as that above described. When the bit is properly positioned on the gauge pins 90, 90 and the barrel is locked to the frame 98, the latter may be slid inwardly along the guide rods to move the bit from the gauge pins in a rectilinear path across the cutting surfaces of the face cutter. to form the bit face. As in the form of the invention rst above described, the barrel holder Aclamp is then released and the barrel rotated relative to the frame 98, as the bit is moved against the side cutter |00. thereby to rotate the bit with respect to the side cutter'to form properly the sides of the bit. A suitable stop 13', similar to the stop collar 13, is provided for the sliding frame 98. so that the bit travel is checked in proper relation with respect to the side cutter. It will be evident that in this form of the invention the necessity of swinging or turning of the frame to bring the holder barrel into a horizontal relation with respect to the side cutter is entirely eliminated, and both the cutting face and sides of the bit are formed by a simple rectilinear movement of the bit-accompanied of course by rotation on its axis during side cuttingwith respectto the face and side milling cutters.

In the modification shown in Figs. 17 to 20, inclusive, the milling cutters and work holder frame are the same as those described above in regard to the preferred illustrative embodimentv of the invention disclosed in Figs. 1 to 14, inclusive. In this instance, however, power operated means is provided for moving the sliding work holder frame 50 along the guide rods relative to the face cutter 4 and for holding the work in operative relation with respect to the side cutter 5. In this construction, pivotally mounted at |05. at one side of the base frame is a lever |05 connected at its lower end, as by a pin and slot connection |01, to a piston rod |08 of a piston |05 of a conventional servo-motor. This piston is reciprocably mounted in a servo-motor cylinder ||0 secured to the base frame. Arranged in the cylinder and acting on the piston |09 is a coil spring constantly urging the piston towards its rearmost released position. Connected to the rear head of the cylinder is a pipe ||2 for supplying pressure fluid to the servo-motor cylinder at the rear side of the piston. 'I'he upper end of the lever |00 is formed with a plane abutment surface ||3 engageable with a roller ||4 journaled on a screw ||5 secured to the adjacent side of the sliding holder frame 50. The lever |06, at its upper end, carries a set screw ||6 arranged in offset relation with respect to the abutment surface I3, and this set screw pro- Vides an abutment engageable with the holder frame 50, for a purpose to be later explained. When the sliding holder frame 50 is in the position shown in Fig. 15 with the drill bit supported in its -face cutting position, and pressure fluid is supplied through the pipe ||2 to the rear end of the cylinder, the piston |09 is moved'forwardly within the cylinder to swing the lever |06 about its pivot, andl the lever, engaging the roller on theA sliding frame, effects movement of the latter along the guide rods, thereby to move the drill bit relative to the face cutter. When the pressure fluid supply to the cylinder is cut off and the cylinder is suitably vented to atmosphere, the coil spring moves the piston |09 into its rearmost released position. and. of course, moves the lever |06 back to the position shown in Fig. 18. When the work holder frame 50 is swung into the position shown in Fig. 19 with the drill bit supported in its side cutting position, the front surface of the frame 50 will assume a position in which it is engageable by the screw HI. and when pressure fluid is again supplied to the servo-motor cylinder to effect movement of the piston, thereby to swing the lever about its pivot, the set screw ||6, in the upper end of the lever, engages the sliding frame 50 to move and 4hold the latter in side cutting position. Otherwise, this form of the invention is the same as that described above in regard to the preferred embodiment of the invention.

As a result of this invention, it will be noted that a novel milling 'machine is provided especially designed for the forming ofthe cutting surfaces of a. rock drill bit. It will further be noted 7l wheel.

that by rotating the milling cutters at a relatively high speed and heating thebit to a safe degree above the critical temperature prior to the hot milling operation, forming of the cutting surfaces of the bit is greatly facilitated and wear'of the cutters is greatly decreased. It will still further be evident that by the provision of rapidly rotating milling cutters, the speed of the forming process is greatly increased over that of a lconventional forging machine or -grinding Other uses and advantageslof`V the improved milling machine will be clearly apparent to those skilled in the art.

While there are in this application specificallydescribed three forms which the invention may assume in practice, it will be understood that these forms of the same are shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

l. In a machinevof the character described, in combination, relatively rotatable circular forming members, means for rotating said members independently of any movement lof the work with respect thereto, and work supporting and guiding means for guiding the work into and supporting it in cooperating forming relation with respect to v said forming members, said supporting and guidmembers one at a time including means for changing means constructed and arranged to preclude the existence of forming relation of the work with more than one of said forming members at a time and serving to support and guide the work during its transition from one forming member to the other.

2. In a machine of the character described, in combination, relatively rotatable circular forming members, means for rotating said members, and Work supporting and guiding means for guiding the work into and supporting it in cooperating forming relation with respect to said forming ing the angular relation of the work with respect to said forming members during the transition oi the Work from one forming member to the other.

3. In a machine of the character described, in combination, relatively rotatable circular forming Vmembers, means for rotating said members, and

work supporting and guiding means for guiding the work into and supporting it in cooperating forming relation with, respect to said forming members, said work supporting and guiding means constructed and arranged to preclude the existence of forming relation of the work with more than one of said forming members at a time and serving to support and kguide the work during its transition from one forming member to the other, and said supporting and guiding means including means for guiding the work in a rectilinear path with respect to one forming member and for supporting the Work for rotation with respect to the other forming member.

4. In a machine of the character described, in combination, relatively rotatable circular forming members,'means for rotating said members, and work supporting and guiding-means for. supporting the work for adjustment into and supporting it in one position with respect to one forming member and for supporting the work for adjustment into a right angle position with respect to along ,said supporting and guiding means during its forming relation with respect to one forming member, and means operative when the'work is lsupported in cooperating forming relation with the other forming member, for rotating the work.

6. In a milling machine, in combination, relatively rotatable. face and 'side milling cutters, means for driving said cutters, work supporting and guiding means for supporting and guiding the work with respect to said cutters, said supporting and guiding means embodying means for locating the work in different positions with respect to said cutters, said supporting and guiding means serving to support and guide the work during its transition from one cutter to the other, and means for rotating the work when the latter is located in forming relation with respect to said side milling cutter.

'7. In a milling machine, in combination, relatively rotatable face and side milling cutters, means for driving said cutters, work supporting and guiding means for supporting the work for Illil guided movement during its ltransition from one y cutter to ,the other. and means for rotating the work when the latter is in cooperating forming relation with respect to one of said cutters.

8. In a milling machine, in combination, relatively rotatable face and side milling cutters arranged onparallei axes, means for driving said cutters, work supporting and guiding means for locating and supporting the work in diderent positions with respect to said cutters one at a time, and means for rotating the work when the latter is in forming position with respect to one of said cutters.

9. In a milling machine, in combination, rela= tively rotatable face and side milling cutters, means ior driving said cutters, work supporting and guiding means for supporting the Wort; for guided movement during its transition from one cutter to the other, said supporting and guiding means supporting the work in cooperating forming relation with said cutters one at a time, and means for rotating the work when the latter is in forming relation with respect to said side milling cutter.

l0. Ina milling machine, in combination, rela tively rotatable tace and side milling cutters, means for driving said cutters, and work supporting and guiding means for supporting the work for guided movement into and supporting it in cooperating forming relation with said cutters singly including means for adjusting the work into diierent angular relations with respect to said ing a guideway arranged at right angles to the cutter axes and' a work holding frame slidably guided on said guideway, said work holding frame being guided on said guideway and supporting the work for movement along said guideway during the transition oi' the work from one cutter to the other.

12. In a milling machine. in combination, relatively rotatable face and side milling cutters, means for driving said cutters, and work supporting and guiding means for locating and supporting the work in different positions with respect to said cutters including a guideway arranged at right angles to the cutter axes and a work holding frame slidably guided on said guldeway, said frame being swingable relative to said guideway to change the angular relation of the work with respect to said cutters.

13. In a millingl machine. in combination, relatively rotatable face and side milling cutters, means for driving said cutters independently oi' any movement of the work with respect thereto. and work supporting and guiding means for locating and supporting the work in diiier'ent positions with respect to said cutters including means for supporting the work for rectilinear guided movement with respect to one cutter and for lateral movement with respect to the other cutter.

14. In a milling machine. in combination, relatively rotatable face and side milling cutters, means for driving said cutters independently of any movement of the work with respect thereto. and work supporting and guiding means for locating and supporting the work in .different positions with respect to said cutters including means for supporting the work for guided movement in a rectilinear path with respect to one cutter and for adjusting the work into a right angle position with respect to its position when moving in said path to bring it into work relation to said other cutter.

l5. In a machine of the character described, in combination, a circular forming member lournaled for rotation, means for rotating said member, and guiding structure arranged adiacent to said forming member and mounted to swing about a pivot arranged in parallel relation with the axis of rotation oi' said forming member, means for adjusting said guiding structure about its pivot relative to said forming member. asupporting frame slidably guided onsaid guiding structure for supporting kthe work for guided movement in a rectilinear path with respect to said forming member, and a work holder barrel mounted on said frame for adjustment relative to said guiding structure.

16. In a machine of the character described, in combination, a circular forming member journaled for rotation, means for rotating said member, means providing a guideway adjacent to said forming. member, means associated with said guideway-providing means for gauging the work with respect to said forming member, and means slidably guidedon the guideway for supporting the work with respect to said gauging means and for guiding the work in a rectilinear path with respect to said forming member.

'17. In a milling machine, in combination, relatively rotatable iace and side milling cutters disposed on axes arranged in right angular rela'- tion, means for driving said cutters independently of any movement of the work with respect thereto, and supporting and guiding means for locating and supporting the work in different positions with respect to said cutters, said supporting and guiding means serving to support and guidev the work during its transition from one cutter tothe other. v

18. In a machine oi the character described,

poetas in combination, relatively rotatable circular forming members. means for rotating said members independently of any movement o1' the work with respect thereto, work supporting and guiding means for 'guiding the work into and sup- Aporting'it in cooperating forming relation with respect to said forming members one at a time, and power operated means for moving the work along said supporting and guiding means relative to said forming members during the transition ofthe work from one forming member to the other.

19. In a machineof the character described. in combination. relatively rotatable circular forming members, means for rotating said members, work supporting and guiding means for guiding the work into and supporting it in cooperating forming relation with respect to said forming members one at a time, including means for guiding the work in a rectilinear path with respect to one forming member and for supporting the work for rotation with respect to the other forming member, and power operated means for moving said work supporting means in said rectilinear path with respect to one' forming member.

20. In a machine of the character described, in combination, relatively rotatable circular forming members, means for rotating said members, work supporting and guiding means for guiding the work into an'd supporting it in cooperating forming relation with respect to said forming members one at a time, including means for'guiding the work in a rectilinear path with respect to one forming member and supporting the work for rotation with respect to the other forming member, and power operated means for moving Vsaid work-supporting means in said rectilinear path with respect to one forming member and i'or holding the work in operative relation with respect to said other forming member.

21.1n a milling machine, a rotatable face milling cutter, a rotatable side milling cutter, a work holder movable into cooperating relation with one or with the other of said cutters, means for guiding said work holder vduring its transition from one cutter to the other, and means for eil'ecting rotation of the work when the latter is in cooperating forming relation with respect to said side milling cutter.

22. In a milling machine for forming drill bits,

'in combination, a rotatable face milling cutter,

a rotatable side milling cutter, means for driving said cutters, means on which a drill bit is supported for rectilinear movement with respect to said tace milling cutter and for rotary movement 'with respect to said side milling cutter, and means for guiding the bit-supporting means during transition of the bit from one cutter to the other.

23. In a machine of the character described. in combination. relatively rotatable circular forming members. one for forming the face oi the work and the other for forming the sides oi' the work, means for rotating said members, and work supporting and guiding means for guiding the face and vsides oi the work into and supporting them in cooperating forming relation with respect to said forming members, saidfsupporting and guiding means constructed and arranged to preclude the existence of forming relation of the work with more than one of said forming membersatatimeandservingtosupportandgs guide the work during its transition from one forming member to the other.

24. In a machine of the character described, in combination, relatively rotatable circular forming members, one for forming the facelof the work and'the other for forming the sides of the work, means for rotating said members, and work supporting and guiding means for guiding the face and sides of the work into and supporting them in cooperating relation with respect to said face and side forming members separately, said supporting and guiding means supporting and guidingfthe work during its transition from one forming member to the other l including means whereby the angular relation 0f the Work may be changed with respect to different forming members during the transition of the work from one forming member to the other.

ing relation with respect to said forming members, said supporting and guiding means constructed and arranged to preclude the existence of forming relation of the work with more than one of said forming members at a time and serving to support and guide the work during its transition from one forming member td the other, and a servo-motor for moving the work along said supporting and. guiding means during its transition from one cutter to the other.

, 4 '7 '26. In a milling machine, in combination, relatively rotatable faceand side milling cutters, means for driving said cutters. work supporting and guiding means for guiding the work into and for supporting the work in cooperating forming relation with respect to said forming members, said supporting and guiding means constructed and arranged to preclude the existence of forming relation of the work with more than one of said forming members at a time and serving to support 4and guide the work during its transition from one forming` memberl to the other, and a servo-motor for moving the work along said supporting and guiding means during its transition from one cutter to the other and for holding the work in operative forming relation with respect to one of said cutters.

2,7. In a machine of the character described, in combination, a circular forming member journaled for rotation, means for rotating said member, adjustable means providing a guideway adg jacent to said forming member, means fo`r admeans slidably guided on the guideway for supporting the work with respect to said gauging means and for guiding the work in a rectilinear path With respect to said forming member.

noBER'r al a: 

